CA2492304C - Cartridge containing one serving of coffee powder for preparing a coffee beverage - Google Patents

Cartridge containing one serving of coffee powder for preparing a coffee beverage Download PDF

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Publication number
CA2492304C
CA2492304C CA002492304A CA2492304A CA2492304C CA 2492304 C CA2492304 C CA 2492304C CA 002492304 A CA002492304 A CA 002492304A CA 2492304 A CA2492304 A CA 2492304A CA 2492304 C CA2492304 C CA 2492304C
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CA
Canada
Prior art keywords
cartridge
cartridge according
coffee
filter element
lower portion
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Expired - Fee Related
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CA002492304A
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French (fr)
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CA2492304A1 (en
Inventor
Arthur Schmed
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Caffita System SpA
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Caffita System SpA
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/8043—Packages adapted to allow liquid to pass through the contents
    • B65D85/8055—Means for influencing the liquid flow inside the package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H3/00—Storage means or arrangements for workshops facilitating access to, or handling of, work tools or instruments
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45F—TRAVELLING OR CAMP EQUIPMENT: SACKS OR PACKS CARRIED ON THE BODY
    • A45F5/00—Holders or carriers for hand articles; Holders or carriers for use while travelling or camping
    • A45F5/02—Fastening articles to the garment
    • A45F5/021—Fastening articles to the garment to the belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/8043—Packages adapted to allow liquid to pass through the contents
    • B65D85/8061—Filters
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45F—TRAVELLING OR CAMP EQUIPMENT: SACKS OR PACKS CARRIED ON THE BODY
    • A45F2200/00—Details not otherwise provided for in A45F
    • A45F2200/05—Holder or carrier for specific articles
    • A45F2200/0575—Portable tools

Abstract

Disclosed is a cartridge containing one serving of coffee powder for preparing a coffee beverage. The bottom of the cartridge is provided with a passage covered by a gas-tight foil. The foil is manually removed before the cartridge is inserted into the coffee machine. Between the passage and the coffee powder, a filter element is disposed, preventing coffee powder to escape from the cartridge. The passage shall prevent a hydraulic pressure build-up in the cartridge, which would lead to the formation of froth.

Description

CARTRIDGE CONTAINING ONE SERVING OF COFFEE POWDER
FOR PREPARING A COFFEE BEVERAGE
Background of the Invention 25833US.doc The present invention refers to a cartridge containing one serving of coffee powder for preparing a coffee beverage. Such cartridges are well known in the art in a plurality of embodi-menu, whereby particularly cartridges for preparing so-called es-presso coffee beverage are in widespread use. The fundamental ad-vantage of such cartridges may be seen in the fact that they are gas-tight, whereby the coffee powder is contained therein without oxygen that would impair the quality of the coffee powder during storage of the cartridge. Thus, the coffee powder contained in such cartridges keeps its freshness for a long time.
For brewing the coffee powder contained in the cartridge, ei-ther manually operated or semi-automatic as well as fully auto-matic coffee makers are used. Usually, in a manually operated cof-fee maker, the cartridge is inserted into a cartridge holder that in turn is inserted into the coffee maker. In the semi-automatic coffee makers, the cartridge is inserted into a cartridge retainer or directly into the brewing chamber of the machine, whereby the brewing chamber is manually closed by means of a central lever mechanism. In a fully automatic coffee maker, however, the car-25833US.doc tridge is .:emoved from a cartridge magazine and automatically in-serted into the brewing chamber; after the brewing operation, the cartridge is removed from the brewing chamber and discarded into a trash receptacle without any intervention of the operator.
All these above mentioned species of coffee maker usually com-prise a hollow so-called brewing spike provided with radial outlet openings for injecting brewing water into the cartridge that is also adapted to punch the bottom and the cover, respectively, of the cartridge. Also known are manually operated coffee makers in which the cartridge retainer is provided with a plurality of em-bossments located on an outlet grate; these embossments break open the cover of the cartridge as soon as brewing water is injected into the cartridge from the opposite side thereof and the car-tridge is pressed against the embossments under the influence of the hydraulic overpressure created by the pressurized brewing wa-ter. During the subsequent brewing operation, the brewing water is injected into the cartridge by means of the brewing spike, with the result that is flows under pressure through the coffee powder contained in the cartridge and escapes from the cartridge through the opening created by the embossments.
Independent of the fact whether it is a manually operated cof-fee maker or a semi-automatic or a fully automatic machine, the coffee maker is designed and adapted to the cartridge so as to produce a coffee beverage having froth on its surface; that froth 25833US.doc usually is considered as a characteristic of a good coffee bever-age.
Even if great efforts have been taken to ensure that the pre-pared coffee beverage has durable froth on its surface, in certain countries the desire arises to prepare also conventional coffee in the sense of a filter coffee by means of these coffee makers. In place of the expression "filter coffee", also the expression "gen-tle coffee" is used.
17 ,.. : .-, ~.. T ...+-The U.S. Patent document 2003/172813 discloses a cartridge of the kind referred to herein. It contains a substance extractable by means of water for preparing a beverage, preferably an espresso coffee. Thereby, a sieve-like member is disposed between the bot-tom of the cartridge and the substance and/or between the cover of the cartridge and the substance, provided with a plurality of ax-ial apertures. The sieve-like member is provided with stampings directed towards the bottom of the cartridge and the cover of the cartridge, respectively, such that fluid channels are formed be-tween the sieve-like member and the bottom of the cartridge, and the sieve-like member and the cover of the cartridge, respec-tively. In these channels, the brewing water can be distributed over the cross sectional area of the cartridge, and the prepared beverage can be collected in these channels, respectively. In or-25833US.doc der to prevent that the sieve-like member is punched upon piercing the cartridge, the sieve-like member comprises a central recess directed towards the interior of the cartridge into which the piercing member can extend once the cover or the bottom of the cartridge have been pierced. Even if such a cartridge is well suitable for preparing espresso coffee, it can hardly be used for preparing normal filter coffee, since the cartridge presents a high flow resistance to the brewing water flowing there trough;
the result is a formation of froth.
The patent document EP 0,326,685 discloses a container, called a brewing chamber, adapted to be disposed of after use, which is collapsible and to the bottom of which a filter bag containing ground coffee or tea is glued. Preferably, the container is made of paper, carton or a similar material. The bottom of the con-tamer is provided with an outlet opening located below the filter bag through which the prepared beverage can flow out. In a pre-ferred embodiment of the container, the outlet opening is covered at the outside with a removable foil. Such a container may be us-able in a conventional filter coffee machine, but not in an es-presso coffee machine.
Objects of the Invention It is an object of the present invention to provide a car-tridge containing one serving of coffee powder for preparing a 25833US.doc coffee beverage which can be used in a conventional espresso cof-fee machine to prepare a normal coffee beverage not having froth on its surface and corresponding in taste to a normal filter cof-fee.
Summary of the Invention To meet this and other objects, the present invention provides a cartridge containing one serving of coffee powder for preparing a coffee beverage, comprising a cartridge body having a bottom portion and a cover portion, the bottom portion of the cartridge body having a passage covered by a gas-tight foil member, and a filter element located inside the cartridge body between the cof-fee powder and the passage in the bottom portion of the cartridge body.
By providing at least the bottom portion of the cartridge with a passage constituted by an aperture, adapted to avoid a hydraulic pressure build-up in the interior of the cartridge during brewing and extracting the coffee powder, the fundamental prerequisite is realized to use such a cartridge in a conventional espresso ma-chine for preparing a coffee beverage corresponding in appearance and taste to a normal filter coffee. The passage ensures that the pressurized brewing water fed into the cartridge cannot create a substantial pressure build-up in the interior of the cartridge.
Thus, the brewing water can flow through the cartridge and, 25833US.doc thereby, through the coffee powder contained therein without any substantial resistance, thereby avoiding the formation of froth.
In order to prevent the coffee powder contained in the car-fridge from escaping the cartridge through the afore mentioned passage and from being flushed out by the brewing water, a filter element is arranged between the passage and the coffee powder con-tamed in the cartridge. In order to ensure that the coffee powder contained in the cartridge keeps well during an extended period of time in spite of the passage provided in the cartridge, the pas-sage is covered by a gas-tight foil. The latter one is either manually removable or designed such that it can be easily pierced by a punching member.
Brief Description of the Drawings In the following, embodiments of the cartridge according to the invention will be further described, with reference to the ac-companying drawings, in which:
Fig. 1 shows the elements of a coffee powder cartridge accord-ing to the invention in an exploded view;
Fig. 2 shows a longitudinal sectional view of a first embodi-ment of a coffee powder cartridge according to the invention;
Fig. 3 shows a longitudinal sectional view of a second embodi-ment of a coffee powder cartridge according to the invention; arid Fig. 4 shows an enlarged portion of Fig. 3.

_ ~ _ Detailed Description of the Preferred Embodiments 25833US.doc The coffee powder cartridge according to Fig. 1 comprises a cup-like shaped lower portion 1, a lower filter element 2, an up-per distribution member 3 and a cartridge cover member 4. The cof-fee powder to be received in the lower portion 1 of the cartridge between the filter element 2 and the distribution member 3 is not shown in Fig. 1. The filter element 2 and the distribution member 3 are dimensionally stable and have essentially disc-like shape;
preferably, they are manufactured by a deep drawing process.
The upper region of the lower portion 1 of the cartridge, slightly conically widening towards it top, is provided with a enlarged portion 5, establishing an annular shoulder 5a at the in-side of the cartridge, serving for supporting the upper distribu-tion member 3. At the top, the cup-shaped portion 1 of the car-tridge comprises a circumferential edge portion 6 to which a cover 4 is fixed, preferably welded. As schematically indicated in Fig.
1 by dashed lines, the bottom 7 of the cup-shaped portion 1 of the cartridge is provided with a round aperture 20 for forming a pas-sage 22, which is covered by a foil 21. The foil 21 comprises a flap L, laterally protruding from the cup-shaped portion 1 of the cartridge, facilitating a manual removal of the foil 21. The cup-shaped portion 1 of the cartridge, the cover 4 as well as the foil 21 consist of a gas-tight multi-layer composite material, whereby g _ 25833US.doc the lower portion 1, as compared to the cover 4 and the foil 21, is relatively stiff, dimensionally stable, elastic and ductile.
After the aperture 20 having been covered by the foil 21, and after the cover having been welded to the circumferential edge portion 6 of the cup-shaped portion 1 of the cartridge, the car-tridge and, thereby, its content are air-tightly sealed. All these foil materials used for manufacturing the lower portion 1 of the cartridge, the cover 4 and the foil 21 preferably comprise at least one gas-tight layer as well as a layer of a thermoplastic polymer. Layers of thermoplastic polymer are easily welded to each other, for instance under the influence of heat or ultrasound.
The filter element 2, having essentially dish-like shape, is provided with a circumferential edge portion 11 and comprises a plurality of stampings 9 having essentially the shape of annular segments and protruding above the bottom of the filter element 2 downwards. Once the filter element 2 is inserted into the cup-shaped portion 1, the stampings 9 rest on the bottom of the por-tion 1 of the cartridge. Thus, between the stampings 9 and the bottom of the portion 1 of the cartridge, collection channels 17 are formed that extend, with reference to a central vertical axis, radially outwards and circularly around the central axis. In the areas between the stampings 9, in the region of the channels 17, the filter element 2 is provided with a plurality of apertures 8.
In the center of the filter element 2, a central, cone-shaped re-_ g -25833US.doc cess 10 is provided that is directed towards the interior of the cartridge.
The upper distribution member 3 also comprises a plurality of stampings 13 having essentially the shape of annular segments and protruding above the top of the distribution member 3 upwards. Be-tween the stampings 13, at the top of the distribution member 3, fluid channels 18 are formed that extend, with reference to a cen-tral vertical axis, radially outwards and circularly around the central axis. In the areas between the stampings 13, in the region of the channels 18, the distribution member 3 is provided with a plurality of apertures 14. In the center of the distribution mem-ber 3, a central, cone-shaped recess 15 is provided that is di-rected towards the interior of the cartridge. Along its periphery, the distribution member 3 is provided with an annular surface por-tion 19, slightly elevated with respect to the fluid channels 18, and being essentially flush with the stampings 13. The edge of the annular surface portion 19 comprises an annular portion 16 extend-ing downwards from the surface portion 19.
Upon inserting the upper distribution member 3 into the cup-shaped lower portion 1 of the cartridge, the distribution member 3 rests with its portion 16 on the shoulder 5a of the enlarged por-tion 5 of the cartridge portion 1. During feeding brewing water into the cartridge for preparing a coffee beverage, the distribu-tion member 3 particularly serves for evenly distributing the 25833US.doc brewing water over the entire cross section of the cartridge, while the lower filter element 2 particularly prevents any coffee powder particles from escaping from the cartridge. Additionally, the upper distribution member 3 also serves as a filter, while the lower filter element 2 also serves to collect and centrally dis-charge the prepared coffee beverage.
In order to arrive at an optimal distribution of the brewing water over the entire cross sectional area of the cartridge and, thereby, at an even soaking of the coffee powder contained in the cartridge, both the apertures 14 provided in the distribution mem-ber 3 and the apertures 8 in the filter element 2 are evenly dis-tributed over the respective surface of the member 3 and element 2, respectively. The entire summed cross sectional area of the ap-ertures 14 provided in the distribution member 3 amounts to at least 3~, preferably to 5~ of the total cartridge cross sectional area. The same relationship is also true for the lower filter ele-ment 2. By his design, it is ensured that the brewing water flows through the distribution member 3 into the interior of the car-tridge without any substantial resistance, and that the prepared coffee beverage can flow through the lower filter element 2 out of the cartridge without any substantial resistance, as well. More-over, the aperture 20 in the bottom 7 of the cartridge ensures that neither at the beginning nor during the brewing operation a hydraulic pressure build-up can take place. By this design, the 25833US.doc formation of froth in the finished coffee beverage can be reliably avoided.
Nevertheless, the size of the apertures 8, 14 in the filter and distribution elements 2, 3 should not be chosen so large that coffee powder can escape from the cartridge. To this end, the di-ameter of a single aperture 8, 14 is made somewhat smaller than the statistic mean value of the diameter of a single particle of the coffee powder. In order not to confront the brewing water with a high flow resistance when it flows through the coffee powder contained in the cartridge, the coffee powder is relatively coarsely ground. The arithmetic mean value of one particle of the coffee powder amounts to between 400 and 600 um in the present ex-ample.
Preferably, the foil 21 has a color that is different from the color of the cartridge. The color of the foil 21 can be selected, for example, to determine the content of the cartridge. In other words, depending on the amount of coffee contained in the car-tridge, the blend of the coffee, or the degree of grinding, a dif-ferent color is selected for the foil.
Fig. 2 shows a longitudinal sectional view of the cartridge of Fig. l, whereby the cartridge is filled with coffee powder KP. The coffee powder KP is enclosed between the lower filter element 2 and the upper distribution member 3 in the cartridge. As can be seen from Fig. 2, fluid channels 17 are formed by the stampings 9 25833US.doc of the lower filter element 2 resting on the bottom 7 of the cup-shaped lower portion 1 of the cartridge into which the prepared coffee beverage can flow through the apertures 8 provided in the lower filter element 2. Similarly, by the stampings 13 provided in the distribution member 3, fluid channels 18 are formed between the distribution member 3 and the cover 4 of the cartridge, by means of which the brewing water is evenly distributed on top of the coffee powder to flow through the apertures 14 for soaking the coffee powder. Due to the fact that both the distribution member 3 and the filter element 2 are dimensionally stable, the channels 17, 18 are preserved even if outer forces affect the cover 4 and the bottom 7 of the cartridge. It is understood that the foil 21 is removed from the bottom 7 of the cartridge prior to inserting the latter one into the coffee machine, as is indicated in Fig. 2 by broken lines.
Once the foil 21 is removed, the cartridge can be inserted into the brewing chamber of a coffee machine (not shown). For punching the cartridge, a punching means, e.g. in the form of a piercing sting 23, is lowered towards the cover 4 of the cartridge and pierces the latter one. Thereby, the piercing sting 23 moves through the cover 4 into the recess 15 provided in the distribu-tion member 3, thus avoiding any damage to the distribution member 3. For feeding brewing water 24 into the interior of the car-25833US.doc tridge, the piercing sting 23 is provided with a central bore, opening into radial outlet openings.
In the present case, it is assumed that the brewing water 24 flows through the cartridge from its top to its bottom. By means of the fluid channels 18, the brewing water is evenly distributed over the entire cross section of the cartridge. Through the aper-tures 14 provided in the upper distribution member 3, the brewing water enters the interior of the cartridge to flow through the coffee powder. Through the apertures 8 in the lower filter element 2, the prepared coffee beverage enters the space below the filter element 2 and escapes from the cartridge through the passage 22 formed by the aperture 20; Therefrom, it is led by not further shown means to a coffee beverage outlet of the coffee machine.
By the provision of the previously described distribution mem-ber 3 and filter element 2, it is ensured that the coffee parti-cles contained in the cartridge are homogenously soaked, resulting in an optimal extraction of the entire coffee powder. The stamp-ings 9, 13 are distributed such that the respective element 2, 3 rests in a two-dimensional way on the bottom 7 of the cartridge and on the cover 4 of the cartridge, respectively. Thereby, it is ensured that the fluid channels 17, 18 maintain their shape be-tween element 2 and bottom 7, and member 3 and cover 4, respec-tively, even if external forces affect the cartridge.

25833US.doc The diameter of the apertures 8, 14 provided in the distribu-tion member 3 and the filter element 2, respectively, is prefera-bly smaller than the statistic diameter of a single particle of the coffee powder, preferably smaller than x-a, whereby x is the arithmetic mean value of the diameter and a is the standard devia-tion. Thereby, it is ensured that essentially no coffee particles can escape from the cartridge, independent of the size of the opening that is punched into the cover 4 by the piercing sting 23.
Fig. 3 shows a longitudinal sectional view of a second embodi-ment of a cartridge filled with coffee powder KP, whereby the ref-erence numerals of corresponding parts and elements are the same as used in Figs. 1 and 2, but with the letter "a" added. The es-sential difference to the embodiment discussed in connection with Figs. 1 and 2 consists in the fact that the passage 22a consti-tuted by the aperture 20a is not covered by a foil from the out-side of the cartridge that is manually removable, but by a foil 21a located at the inside of the bottom 7a of the cartridge and covering the passage 22a, the foil 21a being punched by a piercing sting 35 before the brewing operation starts. The cup-like shaped lower portion la of the cartridge is provided with a slightly out-wardly domed bottom 7a, surrounded along its outer edge by a circumferential annular edge portion 26. The diameter of the aper-ture 20a provided in the bottom 7a of the cartridge is smaller than the corresponding aperture 20 in the first embodiment. The 25833US.doc foil 21a for covering the aperture 20a is located in the interior of the cartridge between the filter element 2a and the bottom 7a of the cartridge.
While the cup-like shaped lower portion la of the cartridge is relatively, stiff, dimensionally stable, elastic and ductile, the foil 21a is, as compared thereto, thinner and comprises a lower elasticity, ductility and tear strength. Thereby, it is ensured that the foil 21a readily tears apart under the influence of the piercing sting 35. In order to keep the foil 21a relatively thin, it is made of a two layer material. The combination of a layer of aluminum and a layer of thermoplastic polymer has been proven to be particularly advantageous. As a thermoplastic polymer, particu-larly suitable are polypropylene or polyethylene. By providing a layer of aluminum, a very good gas-tight sealing can be achieved, while the thermoplastic polymer layer enables a welding of the foil to the bottom 7a of the cartridge.
In the second embodiment, moreover, the cup-like shaped lower portion la of the cartridge is provided with a circumferential groove 27 located at the inside of the lower portion la, while the edge 11a of the filter element 2a is provided with a circumferen-tial annular projection 28 engaging the groove 27 to clampingly fix the filter element 2a in the interior of the cartridge.
Fig. 4 shows an enlarged portion of Fig. 3, particularly a portion of the bottom 7a of the cartridge, together with the aper-25833US.doc ture 20a provided therein and the foil 21a covering the aperture 20a. In this illustration, it can be clearly seen that both the lower portion la of the cartridge and the foil 21a comprise multi-ple layers. While the lower portion la and, thereby, the bottom 7a of the cartridge consist of a three-layer composite material, the foil 21a comprises two layers. In the material constituting the lower portion la of the cartridge, the two outer layers 29 and 31 consist of a thermoplastic polymer, while the intermediate layer 30 consists of a gas-tight foil material, for example EVOH (ethyl-ene vinyl alcohol). The lower layer 32 of the foil 21a, facing the cartridge bottom 7a, consists of a thermoplastic polymer as well, while the upper layer 33 facing the interior of the cartridge con-sists of aluminum. Since the layers 31, 32 of the cartridge bottom 7a and the foil 21a, respectively, facing each other, both consist of a thermoplastic polymer, these two layers 31, 32 can easily be welded to each other. The foil 21a has, as compared to the compos-ite material of the cup-like shaped lower portion la of the car-tridge, a relatively low ductility, elasticity and tear strength.
The foil 21a, visible from the outside through the aperture 20a, preferably has another color than the cartridge itself. After the foil 21a and the cover 4 having been welded to the lower por-tion la of the cartridge, the cartridge und, thereby, its content are air-tightly sealed.

25833US.doc Due to the fact that the foil 21a is relatively thin and does not exhibit a high ductility, elasticity or tear strength, it can easily be punched by the piercing sting. Thereby, it is ensured that in a fully automatic espresso coffee machine both conven-tional coffee powder cartridges, suitable for preparing an es-presso coffee having froth on its top, and coffee powder car-tridges as hereinbefore discussed, suitable for preparing a normal coffee without froth, can be used. In any case, the foil is de-signed such that it is punched by a piercing sting even at a rela-tively low force, while a conventional, one-piece coffee powder cartridge, and particularly its bottom, are designed such that the bottom, in a first phase, is elastically deformed and pierced only under the ir_fluence of the pressure of the brewing medium. By such elastic behavior of the bottom of a conventional cartridge, it is ensured that an initial pre-brewing phase takes place. To this end, brewing water is fed into the interior of the cartridge that is still closed at its bottom, thus creating an overpressure in the interior of the cartridge to soak and, if appropriate, swell the coffee powder, before the bottom of the cartridge is punched, whereby the prepared coffee beverage escapes from the cartridge under formation of froth.
Whenever, in the foregoing, the expression "espresso coffee machine" has been used, it was to designate generally a coffee ma-chine, having a brewing chamber adapted to receive the coffee pow-25833US.doc der cartridge and a pump for feeding pressurized water into the cartridge, independently of the fact whether the espresso coffee machine is used for preparing a "small" espresso coffee or a "lar-ger" coffee. Anyway, coffee beverages prepared with an espresso coffee machine have been characterized by the fact that they had froth on the surface. However, by means of the coffee powder car-tridge according to the present invention, it is possible to pre-pare a coffee beverage that does not exhibit any froth and has a taste coming very close to a filter coffee beverage, even using a conventional espresso coffee machine designed for preparing es-presso coffee using special espresso cartridges.

Claims (24)

1. Cartridge containing one serving of coffee powder for preparing a coffee beverage, comprising:
a cartridge body having a cup-like shaped lower portion and a cover portion;
said lower portion of said cartridge body having a passage;
a gas-tight foil member covering said passage; and a filter element located inside said cartridge body between said coffee powder and said passage in said lower portion of said cartridge body.
2. Cartridge according to claim 1 in which said foil member is located at the inside of the cartridge body between said filter element and said lower portion of said cartridge body.
3. Cartridge according to claim 1 in which said cover portion is sealingly attached to said lower portion, said foil member covering said passage being thinner than said lower portion.
4. Cartridge according to claim 3 in which said cup-like shaped lower portion of the cartridge is dimensionally stable.
5. Cartridge according to claim 4 in which said foil member has a lower ductility and tear strength than said cup-like shaped lower portion of the cartridge.
6. Cartridge according to claim 1 in which said foil member is a composite foil consisting of at least two layers.
7. Cartridge according to claim 6 in which at least one layer consists of metal, preferably aluminum.
8. Cartridge according to claim 6 in which at least one layer consists of a thermoplastic polymer.
9. Cartridge according to claim 8 in which said layer consists of a thermoplastic polymer facing said lower portion of said cartridge body and is welded thereto.
10. Cartridge according to claim 1 in which said foil member is attached to the outside of said lower portion and is manually removable.
11. Cartridge according to claim 1 in which said cover portion and said foil member consist of the same material.
12. Cartridge according to claim 1 in which said foil member has a color that is different from the color of said body portion of the cartridge.
13. Cartridge according to claim 1 in which said filter element is dimensionally stable and comprises a plurality of apertures.
14. Cartridge according to claim 13 in which the total cross sectional area of all said apertures in said filter element amounts to at least 3%, particularly to 5% of the mean cross sectional area of said cartridge body portion, such that the prepared coffee beverage can flow through said filter element without substantial resistance to said passage and out of the cartridge.
15. Cartridge according to claim 13 or 14 in which said filter element is provided with a plurality of channels for collecting and discharging the coffee beverage escaping from the cartridge.
16. Cartridge according to claim 1, further comprising a dimensionally stable distribution member located in the interior of said cartridge body member between said cover portion and the coffee powder contained in the cartridge, said distribution member having a plurality of apertures and channels for evenly distributing the brewing water flowing into the interior of the cartridge.
17. Cartridge according to claim 16 in which the total cross sectional area of all said apertures in said distribution member amounts to at least 3%, particularly to 5% of the mean cross sectional area of said cartridge body portion.
18. Cartridge according to claims 15 and 16 in which both said distribution member and said filter element comprise stampings directed towards the interior of the cartridge for constituting said channels, whereby said apertures are located in said channels.
19. Cartridge according to claims 15 and 16 in which said channels extend, departing from a central axis, radially outwards and circularly around the central axis.
20. Cartridge according to claim 16 in which at least said distribution member is arranged or designed such that one or several punching means can be plugged into said cover portion without damaging said distribution member.
21. Cartridge according to claim 20 in which said distribution member comprises at least one recess directed towards the interior of the cartridge into which the punching means can extend after having pierced said cover portion.
22. Cartridge according to claims 13 and 16 in which the statistic mean value of the diameter of a single coffee powder particle amounts to between 400 and 600 µm, and in which the diameter of the apertures provided in the filter element and in the distribution member, respectively, is smaller than the statistic mean diameter of a single coffee powder particle.
23. Cartridge according to claim 1 in which the interior of said cup-like shaped lower portion of said cartridge is provided with an annular groove, and in which said filter element located between said passage and the coffee powder is provided with a peripheral edge portion engaging said groove to clampingly fix said filter element to said lower portion of said cartridge.
24. Cartridge according to claim 8 wherein the thermoplastic polymer is polypropylene or polyethylene.
CA002492304A 2004-01-14 2005-01-13 Cartridge containing one serving of coffee powder for preparing a coffee beverage Expired - Fee Related CA2492304C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004002005A DE102004002005A1 (en) 2004-01-14 2004-01-14 Portion capsule with ground coffee for making a coffee beverage
DE102004002005.1 2004-01-14

Publications (2)

Publication Number Publication Date
CA2492304A1 CA2492304A1 (en) 2005-07-14
CA2492304C true CA2492304C (en) 2008-12-16

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